Its a nice series of problems and i think there are more than enough untied problems for another Sequence and Series problem group. So maybe Chris its about time to curate one :)
Thanks Nikolaos. I was thinking of making a group on primes, but one on sequences and series is a good idea.
I'm interested to see whether anyone uses my approach to this problem--especially after all of the solvers of my Connell sequence problem (Cody Problem 46615) to this point found the easy way.
Which values occur exactly three times?
Find the sum of the elements in the "second" diagonal
Return unique values without sorting
Determine whether a prime is Pythagorean
Determine whether a square can be drawn on a grid of dots
Determine the Zeckendorf expansion of a number
Award medals to winners
Identify Wagstaff primes
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